Interesting.... Does UUID work in cmdline.txt?

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1

So I am using a freshly installed 2019 11 18 image. well dd’d onto a USB HD and resized to the full space. In the first scenario I use UUID and in the second scenario I use the device name. I think they both should use /dev/sda1 as root, but they do not. If you need any other outputs please ask.

Scenario 1:

osmc@osmc:~$ df -k
Filesystem     1K-blocks     Used Available Use% Mounted on
devtmpfs          376668        0    376668   0% /dev
tmpfs             381788     5216    376572   2% /run
/dev/mmcblk0p2   3528640   930264   2399416  28% /
tmpfs             381788        0    381788   0% /dev/shm
tmpfs               5120        0      5120   0% /run/lock
tmpfs             381788        0    381788   0% /sys/fs/cgroup
/dev/mmcblk0p1    322936    26404    296532   9% /boot
/dev/sda3      120047812  7445584 106481064   7% /media/Music
/dev/sda2      120047812 61666708  52259940  55% /media/Movies
/dev/sda1      120120804   936044 113063704   1% /media/00180154-fb7f-4643-9a01-01a4dfce2075
/dev/sda4      120050884 71625816  42303752  63% /media/TVShows
tmpfs              76356        0     76356   0% /run/user/1000
osmc@osmc:~$ more /boot/cmdline.txt
root=UUID=00180154-fb7f-4643-9a01-01a4dfce2075 rootfstype=ext4 rootwait quiet osmcdev=rbp2
osmc@osmc:~$ ls -l /dev/disk/bu-uuid
ls: cannot access '/dev/disk/bu-uuid': No such file or directory
osmc@osmc:~$ ls -l /dev/disk/by-uuid
total 0
lrwxrwxrwx 1 root root 10 Jan 26 18:46 00180154-fb7f-4643-9a01-01a4dfce2075 -> ../../sda1
lrwxrwxrwx 1 root root 15 Jan 26 18:46 61B6-3000 -> ../../mmcblk0p1
lrwxrwxrwx 1 root root 10 Jan 26 18:46 dd7421ad-59ae-431d-a43e-c8db1857bb4f -> ../../sda2
lrwxrwxrwx 1 root root 10 Jan 26 18:46 e3f1aeb9-7d44-4a64-b907-3d9fe9362f9d -> ../../sda3
lrwxrwxrwx 1 root root 10 Jan 26 18:46 f1574921-690e-427c-86b8-1edd14979eee -> ../../sda4
osmc@osmc:~$

It is supposed to go to sda1 but it goes to mmcblk0p2
If I do this though

Scenario 2:

osmc@osmc:~$ df -k
Filesystem     1K-blocks     Used Available Use% Mounted on
devtmpfs          376668        0    376668   0% /dev
tmpfs             381788     5216    376572   2% /run
/dev/sda1      120120804   936060 113063688   1% /
tmpfs             381788        0    381788   0% /dev/shm
tmpfs               5120        0      5120   0% /run/lock
tmpfs             381788        0    381788   0% /sys/fs/cgroup
/dev/mmcblk0p1    322936    26404    296532   9% /boot
/dev/sda2      120047812 61666708  52259940  55% /media/Movies
/dev/sda3      120047812  7445584 106481064   7% /media/Music
/dev/mmcblk0p2   3528640   930248   2399432  28% /media/00180154-fb7f-4643-9a01-01a4dfce2075
/dev/sda4      120050884 71625816  42303752  63% /media/TVShows
tmpfs              76356        0     76356   0% /run/user/1000
osmc@osmc:~$ more /boot/cmdline.txt
root=/dev/sda1 rootfstype=ext4 rootwait quiet osmcdev=rbp2
osmc@osmc:~$ ls -l /dev/disk/by-uuid/
total 0
lrwxrwxrwx 1 root root 10 Jan 26 18:35 00180154-fb7f-4643-9a01-01a4dfce2075 -> ../../sda1
lrwxrwxrwx 1 root root 15 Jan 26 18:35 61B6-3000 -> ../../mmcblk0p1
lrwxrwxrwx 1 root root 10 Jan 26 18:35 dd7421ad-59ae-431d-a43e-c8db1857bb4f -> ../../sda2
lrwxrwxrwx 1 root root 10 Jan 26 18:35 e3f1aeb9-7d44-4a64-b907-3d9fe9362f9d -> ../../sda3
lrwxrwxrwx 1 root root 10 Jan 26 18:35 f1574921-690e-427c-86b8-1edd14979eee -> ../../sda4

It works!

2

But in scenario 2 why is mmcblk0p2 assigned the UUID for /dev/sda1?
That’s a secondary question.

3

Use PARTUUID

4

OK I’ll try that. Thanks for the quick response!

5

PARTUUID did not work it put me in the OSMC initramfs rescue console. I’ll just use /dev/sda1, though it may break if I add another thumb drive to it.

6

I did reformat your post for better readability.
How did you create the partition on sda1, did you clone the SD Card?
What does lsblk -f say also what is the UUID you see when you connect the USB and separetely the SD Card to your PC?

7

Yes, I did. I just DD’d mmcblk0p2 to sda1 and then resized it.
yes from my computer. They were both unmounted filesystems at the time.

8

DD will obviously create a copy that end up with the same UUID.
If you want to use them on the same system you would need to change the UUID of one of them.

9

Ahh ok forgot about that!

10

Oh and I forgot to say thanks!